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https://github.com/jamiepine/voicebox.git
synced 2026-10-04 09:35:16 -07:00
fix(mlx): release the model binding inside the sync bodies so a failing op's traceback cannot pin it
Review follow-up: the post-op drain ran in a finally, but on the error path the exception's traceback kept the _generate_sync/_transcribe_sync frame (and its model local) alive, so mx.clear_cache() had nothing to return. Each sync body now drops its model (and tokenizer) binding in its own finally before the exception propagates.
This commit is contained in:
jamiepine
committed by
capy-ai-staging[bot]
capy-ai-staging[bot]
parent
fb67ad436c
commit
63899fd865
@@ -241,70 +241,76 @@ class MLXTTSBackend:
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# thread mid-generation cannot turn a later self.model read into
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# None (the fallback path below runs seconds into a request).
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model = self.model
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# MLX generate() returns a generator yielding GenerationResult objects
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audio_chunks = []
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sample_rate = 24000
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lang = LANGUAGE_CODE_TO_NAME.get(language, "auto")
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# Set seed if provided (MLX uses numpy random)
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if seed is not None:
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import mlx.core as mx
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np.random.seed(seed)
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mx.random.seed(seed)
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# Extract voice prompt info
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ref_audio = voice_prompt.get("ref_audio") or voice_prompt.get("ref_audio_path")
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ref_text = voice_prompt.get("ref_text", "")
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# Validate that the audio file exists
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if ref_audio and not Path(ref_audio).exists():
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logger.warning("Audio file not found: %s", ref_audio)
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logger.warning("This may be due to a cached voice prompt referencing a deleted temp file.")
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logger.warning("Regenerating without voice prompt.")
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ref_audio = None
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# Inference runs with the process's default HF_HUB_OFFLINE
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# state. Forcing offline here (previously used to avoid lazy
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# mlx_audio lookups hanging when the network drops mid-inference,
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# issue #462) regressed online users because libraries make
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# legitimate metadata calls during generation.
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try:
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if ref_audio:
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# Check if generate accepts ref_audio parameter
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import inspect
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# MLX generate() returns a generator yielding GenerationResult objects
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audio_chunks = []
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sample_rate = 24000
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lang = LANGUAGE_CODE_TO_NAME.get(language, "auto")
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sig = inspect.signature(model.generate)
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if "ref_audio" in sig.parameters:
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# Generate with voice cloning
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for result in model.generate(text, ref_audio=ref_audio, ref_text=ref_text, lang_code=lang):
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audio_chunks.append(np.array(result.audio))
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sample_rate = result.sample_rate
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# Set seed if provided (MLX uses numpy random)
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if seed is not None:
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import mlx.core as mx
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np.random.seed(seed)
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mx.random.seed(seed)
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# Extract voice prompt info
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ref_audio = voice_prompt.get("ref_audio") or voice_prompt.get("ref_audio_path")
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ref_text = voice_prompt.get("ref_text", "")
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# Validate that the audio file exists
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if ref_audio and not Path(ref_audio).exists():
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logger.warning("Audio file not found: %s", ref_audio)
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logger.warning("This may be due to a cached voice prompt referencing a deleted temp file.")
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logger.warning("Regenerating without voice prompt.")
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ref_audio = None
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# Inference runs with the process's default HF_HUB_OFFLINE
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# state. Forcing offline here (previously used to avoid lazy
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# mlx_audio lookups hanging when the network drops mid-inference,
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# issue #462) regressed online users because libraries make
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# legitimate metadata calls during generation.
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try:
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if ref_audio:
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# Check if generate accepts ref_audio parameter
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import inspect
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sig = inspect.signature(model.generate)
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if "ref_audio" in sig.parameters:
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# Generate with voice cloning
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for result in model.generate(text, ref_audio=ref_audio, ref_text=ref_text, lang_code=lang):
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audio_chunks.append(np.array(result.audio))
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sample_rate = result.sample_rate
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else:
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# Fallback: generate without voice cloning
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for result in model.generate(text, lang_code=lang):
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audio_chunks.append(np.array(result.audio))
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sample_rate = result.sample_rate
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else:
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# Fallback: generate without voice cloning
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# No voice prompt, generate normally
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for result in model.generate(text, lang_code=lang):
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audio_chunks.append(np.array(result.audio))
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sample_rate = result.sample_rate
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else:
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# No voice prompt, generate normally
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except Exception as e:
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# If voice cloning fails, try without it
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logger.warning("Voice cloning failed, generating without voice prompt: %s", e)
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for result in model.generate(text, lang_code=lang):
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audio_chunks.append(np.array(result.audio))
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sample_rate = result.sample_rate
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except Exception as e:
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# If voice cloning fails, try without it
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logger.warning("Voice cloning failed, generating without voice prompt: %s", e)
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for result in model.generate(text, lang_code=lang):
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audio_chunks.append(np.array(result.audio))
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sample_rate = result.sample_rate
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# Concatenate all chunks
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if audio_chunks:
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audio = np.concatenate([np.asarray(chunk, dtype=np.float32) for chunk in audio_chunks])
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else:
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# Fallback: empty audio
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audio = np.array([], dtype=np.float32)
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# Concatenate all chunks
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if audio_chunks:
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audio = np.concatenate([np.asarray(chunk, dtype=np.float32) for chunk in audio_chunks])
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else:
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# Fallback: empty audio
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audio = np.array([], dtype=np.float32)
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return audio, sample_rate
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return audio, sample_rate
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finally:
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# Drop the local binding here, inside the frame a propagating
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# traceback would keep alive, so the caller's drain can
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# actually return the model's buffers to MLX.
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del model
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def _reload_and_generate_sync():
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"""Ensure the configured model is loaded, then generate — as ONE
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@@ -324,9 +330,10 @@ class MLXTTSBackend:
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finally:
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# An unload_model() that landed while we were generating only
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# dropped the backend's reference; the model's buffers were
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# kept alive by _generate_sync's local and have just been
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# returned to MLX's pool (on success or failure). Drain it now,
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# or they stay resident until the next load/unload cycle.
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# kept alive by _generate_sync's local, which that function
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# drops in its own finally (so a propagating traceback cannot
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# pin it), and have just been returned to MLX's pool. Drain it
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# now, or they stay resident until the next load/unload cycle.
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if self.model is None:
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empty_mlx_cache()
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@@ -423,24 +430,30 @@ class MLXSTTBackend:
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# MLX Whisper transcription using generate method
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# The generate method accepts audio path directly
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model = self.model
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decode_options = {}
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if language:
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decode_options["language"] = language
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try:
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decode_options = {}
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if language:
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decode_options["language"] = language
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# Inference runs with the process's default HF_HUB_OFFLINE
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# state — see the comment in MLXTTSBackend.generate for the
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# regression this revert fixes (issue #462).
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result = model.generate(str(audio_path), **decode_options)
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# Inference runs with the process's default HF_HUB_OFFLINE
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# state — see the comment in MLXTTSBackend.generate for the
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# regression this revert fixes (issue #462).
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result = model.generate(str(audio_path), **decode_options)
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# Extract text from result
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if isinstance(result, str):
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return result.strip()
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elif isinstance(result, dict):
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return result.get("text", "").strip()
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elif hasattr(result, "text"):
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return result.text.strip()
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else:
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return str(result).strip()
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# Extract text from result
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if isinstance(result, str):
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return result.strip()
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elif isinstance(result, dict):
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return result.get("text", "").strip()
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elif hasattr(result, "text"):
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return result.text.strip()
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else:
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return str(result).strip()
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finally:
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# Drop the local binding here, inside the frame a propagating
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# traceback would keep alive, so the caller's drain can
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# actually return the model's buffers to MLX.
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del model
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def _reload_and_transcribe_sync():
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"""Ensure the requested model is loaded, then transcribe — as ONE
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@@ -305,21 +305,27 @@ class MLXQwenLLMBackend:
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from mlx_lm.sample_utils import make_sampler
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model, tokenizer = self.model, self.tokenizer
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messages = _build_messages(prompt, system, examples)
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chat_prompt = tokenizer.apply_chat_template(
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messages,
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tokenize=False,
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add_generation_prompt=True,
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enable_thinking=False,
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)
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try:
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messages = _build_messages(prompt, system, examples)
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chat_prompt = tokenizer.apply_chat_template(
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messages,
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tokenize=False,
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add_generation_prompt=True,
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enable_thinking=False,
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)
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sampler = make_sampler(temp=temperature, top_p=0.9) if temperature > 0 else None
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text = mlx_generate(
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model,
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tokenizer,
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prompt=chat_prompt,
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max_tokens=max_tokens,
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sampler=sampler,
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verbose=False,
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)
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return text.strip()
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sampler = make_sampler(temp=temperature, top_p=0.9) if temperature > 0 else None
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text = mlx_generate(
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model,
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tokenizer,
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prompt=chat_prompt,
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max_tokens=max_tokens,
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sampler=sampler,
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verbose=False,
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)
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return text.strip()
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finally:
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# Drop the local binding here, inside the frame a propagating
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# traceback would keep alive, so the caller's drain can
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# actually return the model's buffers to MLX.
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del model, tokenizer
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